<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <link rel="stylesheet" href="./css/inputnumber.css"/>
    <link rel="stylesheet" href="./css/index.css"/>
    <title>购物车</title>
</head>
<body>
<div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt=""/></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length > 0">
        <div class="table">
            <!-- 头部 -->
            <div class="thead">
                <div class="tr">
                    <div class="th">选中</div>
                    <div class="th th-pic">图片</div>
                    <div class="th">单价</div>
                    <div class="th num-th">个数</div>
                    <div class="th">小计</div>
                    <div class="th">操作</div>
                </div>
            </div>
            <!-- 身体 -->
            <div class="tbody">
                <div class="tr" v-bind:class="{active: item.isChecked}" v-for="(item,index) in fruitList" :key="item.id">
                    <div class="td"><input type="checkbox" v-model="item.isChecked"/></div>
                    <div class="td"><img v-bind:src=item.icon alt=""/></div>
                    <div class="td">{{item.price}}</div>
                    <div class="td">
                        <div class="my-input-number">
                            <button v-bind:disabled="item.num <= 1" class="decrease" @click="--item.num"> -</button>
                            <span class="my-input__inner">{{item.num}}</span>
                            <button class="increase" @click="++item.num"> +</button>
                        </div>
                    </div>
                    <div class="td">{{item.price * item.num}}</div>
                    <div class="td">
                        <button @click="del(item.id)">删除</button>
                    </div>
                </div>
            </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
            <!-- 全选 -->
            <label class="check-all">
                <input type="checkbox" v-model="allChecked"/>
                全选
            </label>
            <div class="right-box">
                <!-- 所有商品总价 -->
                <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{totalPrice}}</span></span>
                <!-- 结算按钮 -->
                <button class="pay">结算( {{totalNum}} )</button>
            </div>
        </div>
    </div>
    <!-- 空车 -->
    <div v-else class="empty">🛒空空如也</div>
</div>
<script src="../../lib/vue.js"></script>
<script>
    const defaultList = [
        {
            id: 1,
            icon: './img/火龙果.png',
            isChecked: true,
            num: 2,
            price: 6,
        },
        {
            id: 2,
            icon: './img/荔枝.png',
            isChecked: true,
            num: 7,
            price: 20,
        },
        {
            id: 3,
            icon: './img/榴莲.png',
            isChecked: false,
            num: 3,
            price: 40,
        },
        {
            id: 4,
            icon: './img/鸭梨.png',
            isChecked: true,
            num: 10,
            price: 3,
        },
        {
            id: 5,
            icon: './img/樱桃.png',
            isChecked: false,
            num: 20,
            price: 34,
        },
    ];
    const app = new Vue({
        el: '#app',
        data: {
            // 水果列表
            fruitList: localStorage.getItem('fruitList') ? JSON.parse(localStorage.getItem('fruitList')) : defaultList
        },
        methods: {
            del(id) {
                this.fruitList = this.fruitList.filter(item => item.id !== id)
            }
        },
        computed: {
            allChecked: {
                get() {
                    return this.fruitList.every(item => item.isChecked);
                },
                set(val) {
                    this.fruitList.forEach(item => item.isChecked = val);
                }
            },
            totalPrice() {
                return this.fruitList.filter(item => item.isChecked).reduce((total, item) => total + item.num * item.price, 0);
            },
            totalNum() {
                return this.fruitList.filter(item => item.isChecked).length;
            }
        },
        watch: {
            fruitList: {
                deep: true,
                handler(newVal) {
                    localStorage.setItem('fruitList', JSON.stringify(newVal));
                }
            }
        }
    })
</script>
</body>
</html>
